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Quadrantes :: Quadrantes (pl. ) of Quadran.

Pelecoid :: Pelecoid (n.) A figure, somewhat hatched-shaped, bounded by a semicircle and two inverted quadrants, and equal in area to the square ABCD inclosed by the chords of the four quadrants..

Trirectangular :: Trirectangular (a.) Having three right angles. See Triquadrantal.

Quadrantal :: Quadrantal (n.) A cubical vessel containing a Roman cubic foot, each side being a Roman square foot; -- used as a measure..

Arc :: Arc (n.) A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant..

Log-chip :: Log-chip (n.) A thin, flat piece of board in the form of a quadrant of a circle attached to the log line; -- called also log-ship. See 2d Log, n., 2..

Semiquartile :: Semiquartile (n.) An aspect of the planets when distant from each other the half of a quadrant, or forty-five degrees, or one sign and a half..

Antimeter :: Antimeter (n.) A modification of the quadrant, for measuring small angles..

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

Altimeter :: Altimeter (n.) An instrument for taking altitudes, as a quadrant, sextant, etc..

Mural :: Mural (a.) Of or pertaining to a wall; being on, or in, a wall; growing on, or against, a wall; as, a mural quadrant..

Octant :: Octant (n.) An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O¡, but being itself the eighth part of a circle. Cf. Sextant..

Sight :: Sight (v. t.) A small aperture through which objects are to be seen, and by which their direction is settled or ascertained; as, the sight of a quadrant..

Gunter''s Quadrant :: Gunter's quadrant () A thin quadrant, made of brass, wood, etc., showing a stereographic projection on the plane of the equator. By it are found the hour of the day, the sun's azimuth, the altitude of objects in degrees, etc. See Gunter's scale..

Quadrantal :: Quadrantal (a.) Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space..

Triquadrantal :: Triquadrantal (a.) Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles..

Sinical :: Sinical (a.) Of or pertaining to a sine; employing, or founded upon, sines; as, a sinical quadrant..

Quadrant :: Quadrant (n.) One of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.

Alidade :: Alidade (n.) The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument.

Sextant :: Sextant (n.) An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant..

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